SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fdb67270fe8ad995cc78b6691e7bd553d2eaff3d3fabb10c73b9bd9ab44aa1f' 
  AND token = 'SCL9jVJlu/WjzfwBb04+c5TSg5GZYBwJ2+kaJUOWHNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}